The research, conducted at the Department of Forensic Medicine in Hradec Králové in the Czech Republic, is the first systematic, statistically validated investigation of reactive splenic contraction in human hypothermia deaths. The finding itself is not new to physiology. The spleen acts as a rapidly mobilizable blood reservoir, capable of sequestering up to 200 to 250 milliliters of densely packed erythrocytes. When the sympathetic nervous system fires—during exercise, hypoxia, hemorrhage, or severe stress—the splenic capsule and vessels contract, squeezing stored red blood cells into the circulation and boosting oxygen-carrying capacity within moments. What had never been done before was to rigorously test whether this dramatic physiological response leaves a recognizable and diagnostically reliable footprint at autopsy in people who died of hypothermia.

The study team, led by Lenka Zátopková and Štěpánka Pohlová Kučerová together with senior author Petr Hejna, examined 54 fatalities attributed to accidental hypothermia and compared them against 170 randomly selected control cases representing both natural and non-natural deaths, including heart failure, cardiopulmonary failure, hanging, and suffocation. The researchers defined reactive splenic contraction by a strict macroscopic triad: an apparent reduction in splenic volume or weight relative to the decedent’s body size, wrinkling of the splenic capsule, and anemization of the red pulp on the cut surface, typically accompanied by increased firmness of the tissue. All three components had to be present simultaneously, a deliberately conservative requirement designed to maximize specificity and prevent misclassification based on isolated, nonspecific splenic changes.

The results were unambiguous. The complete contraction triad was identified in 48 of the 54 hypothermia fatalities, a prevalence of 88.9 percent, but in only 2 of the 170 controls, or 1.2 percent. This translates into a sensitivity of 88.9 percent and a specificity of 98.8 percent, with a positive predictive value of 96.0 percent, a negative predictive value of 96.6 percent, and an overall diagnostic accuracy of 96.4 percent. The statistical association between splenic contraction and fatal hypothermia was extraordinarily strong, with an odds ratio of 672.0 and a 95 percent confidence interval stretching from 131.4 to 3437.2, far beyond the threshold of statistical significance. Histological examination of the spleen in every hypothermia case confirmed the macroscopic impression of red-pulp anemization, revealing a depletion of erythrocytes within the red pulp and empty vascular lumina consistent with the wholesale mobilization of the splenic blood store.

Perhaps the most intriguing result concerns how splenic contraction relates to the established markers of hypothermia. Among the classical findings, only Wischnewsky spots showed a statistically significant association with splenic contraction. No significant relationships emerged with cold erythema, the inner knee sign, hemorrhages within core skeletal muscles, or fatty degeneration of renal tubular epithelial cells. In practical terms, this means that splenic contraction does not simply ride along with the other tissue changes of cold death. Among contraction-positive fatalities, cold erythema was absent in more than a quarter of cases, and roughly a third lacked either muscle hemorrhages or renal fatty degeneration; in six cases, both of those deeper findings were missing entirely. Splenic contraction, in other words, appears to carry independent diagnostic information rather than redundant confirmation of what other signs already show.

This independence points toward a compelling pathophysiological interpretation. Hemorrhagic and degenerative lesions such as muscle hemorrhages and renal tubular fatty change generally require prolonged survival and sustained exposure to critical cold before they develop. Splenic contraction, by contrast, reflects an immediate physiological adaptation: acute sympathetic activation, circulatory centralization shunting blood toward vital organs, and the rapid expulsion of the splenic erythrocyte reservoir into the systemic circulation. The authors therefore propose that a contracted spleen may represent one of the earliest morphofunctional responses to lethal cold stress, visible at autopsy even when the slower-developing hemorrhagic and degenerative manifestations have not yet had time to appear. Supporting this view, the mean splenic weight in contraction-positive hypothermia cases was just 76.1 grams, compared with 132.5 grams in contraction-negative hypothermia cases and 175.4 grams in controls, and the difference could not be explained by age differences between the groups.

The scientific groundwork for this conclusion was laid decades ago, though it was largely forgotten. In 1944, the German researcher Wendt demonstrated experimentally in rabbits that whole-body cooling reduced spleen volume by up to one third, with the most pronounced contraction occurring at core temperatures of 24 to 26 degrees Celsius, and that the organ regained its normal size after rewarming. Subsequent animal studies by Varman and Bernshtein corroborated the spleen’s reservoir role under hypothermic conditions, showing decreases in splenic weight and volume accompanied by rising circulating hemoglobin concentrations. Isolated human case reports followed, including Horn’s account of a 49-year-old sailor who died of cold exposure after falling overboard, and retrospective series by Gillner and Waltz and by Schneider and Klug that noted contracted spleens in a minority of hypothermia deaths. Two doctoral dissertations touched on the finding, but neither provided the prospective, controlled evidence needed to establish its diagnostic value, and major forensic textbooks continued to relegate splenic contraction to quotation marks and question marks—or to omit it entirely.

The practical implications for forensic practice are considerable. Hypothermia deaths are frequently misinterpreted at first glance, particularly when the scene suggests sudden natural death, acute intoxication, or even violence. Cold erythema and ecchymosis-like discolorations on the limbs can mimic traumatic injuries, occasionally raising suspicion of assault. In such ambiguous situations, the conditions that mimic hypothermia typically produce a congested, blood-filled spleen, whereas a contracted, pale, wrinkled spleen points decisively in the opposite direction. Because the contracted spleen is readily visible the moment the abdominal cavity is opened—sometimes alongside reverse Wischnewsky spots visible through the gastric wall—its early recognition can redirect the differential diagnosis toward hypothermia and prompt targeted dissection of the back and core musculature, inspection of the knee joints, and supplementary histological and toxicological analyses. The authors also suggest that the finding could support minimally invasive postmortem approaches, such as laparoscopic inspection of body cavities combined with postmortem imaging, where early visual cues carry exceptional value.

Modern imaging may soon extend this diagnostic reach even further. Preliminary work with postmortem computed tomography has reported elevated splenic radiodensity in hypothermia deaths, consistent with a denser, more compact parenchyma produced by contraction, and the present study’s exploratory imaging data showed compatible tendencies, though the small number of cases precluded statistical analysis and will be reported separately. The researchers are careful to emphasize the limits of their work: the study was conducted at a single institution, the macroscopic assessment was not blinded, interobserver agreement was not formally measured, and histological examination of the spleen was performed only in the hypothermia group. Splenic contraction is not pathognomonic and must never be interpreted in isolation. Nevertheless, with nearly nine out of ten hypothermia deaths showing the triad and fewer than two percent of controls doing so, the evidence strongly supports adding routine splenic assessment to the forensic autopsy protocol—transforming an organ long dismissed as morphologically unremarkable into a quiet but eloquent witness to death by cold.

Subject of Research: Validation of reactive splenic contraction as a diagnostic autopsy sign of fatal hypothermia

Article Title: Spleen contraction verified as a supportive autopsy sign of fatal hypothermia

Article References: Zátopková, L., Kučerová, Š. P., Kovařík, D., Pažinová, J., Pitková, R., Bačinová, P., Janík, M., & Hejna, P. (2026). Spleen contraction verified as a supportive autopsy sign of fatal hypothermia. International Journal of Legal Medicine. https://doi.org/10.1007/s00414-026-03984-x

Image Credits: AI Generated

DOI: 10.1007/s00414-026-03984-x

Keywords: hypothermia, forensic pathology, spleen, splenic contraction, autopsy, Wischnewsky spots, cold erythema, postmortem diagnosis, forensic medicine, blood reservoir, postmortem imaging, legal medicine

The central premise of the field has not changed: imaging the dead can answer questions that matter enormously for the living. When a fetus dies in utero, when a newborn succumbs shortly after birth, or when a child dies unexpectedly, families and clinicians want answers. Conventional autopsy has long been the gold standard, but consent rates for full autopsy have fallen across much of the world, driven by religious and cultural concerns, emotional distress and simple unfamiliarity with the procedure. Less-invasive alternatives that use imaging — chiefly postmortem computed tomography and postmortem magnetic resonance imaging — promise a way to recover diagnostic information while respecting families’ wishes. That promise, the commentary argues, has come substantially closer to reality over the past ten years.

The turning point came in organizational form. In 2016, the European Society of Paediatric Radiology convened a dedicated postmortem imaging task force, building on an earlier questionnaire-based survey that had revealed how inconsistent practice was across European centres. That survey, published in 2014, documented wide variation in whether imaging was offered at all, which modalities were used, and how results were reported. The task force gave the field a focal point: a standing group of experts who could translate scattered research findings into practical, consensus-based guidance. The commentary’s authors, who have led much of this effort, frame the past decade as the story of what happened once that structure existed.

The most tangible products of that structure are the protocols. In 2019, a joint working group of the European Society of Paediatric Radiology and the International Society for Forensic Radiology and Imaging published the first standardized protocol for paediatric postmortem computed tomography, specifying how scans should be acquired in children of different sizes and ages. More recently, the task force has turned to magnetic resonance imaging, publishing a referral template for fetal and neonatal postmortem imaging in 2024, a full clinical protocol for fetal and neonatal postmortem MRI in 2025, and, in 2026, recommendations for standardized structured reporting of those examinations. Reporting guidance for perinatal and paediatric postmortem CT followed a parallel track, published in Insights into Imaging in 2024.

Standardized reporting deserves particular emphasis because it addresses one of the field’s most stubborn problems. An imaging study is only as useful as the report that follows it, and early adopters of postmortem MRI found that radiologists described findings in wildly different ways, making it difficult to compare results across centres or to accumulate the evidence base needed to convince coroners, pathologists and funders. The 2026 structured reporting recommendations aim to fix this by defining what must be documented, in what order and with what terminology, so that a postmortem MRI report from Amsterdam can be read and trusted in London, Toronto or Melbourne. It is the kind of unglamorous infrastructure work that rarely makes headlines but determines whether a technique becomes routine or remains a curiosity.

The evidence base itself has grown in parallel. One of the decade’s most influential studies, the DRIFT trial published in The Lancet Child & Adolescent Health in 2018, compared chest radiographs with computed tomography for detecting rib fractures in children and provided diagnostic accuracy data that directly inform how skeletal injury should be assessed after death. Other work has pushed into more sophisticated territory: diffusion-weighted postmortem MRI of the fetal brain has been used to help time perinatal deaths, a question with real forensic and medico-legal significance, while feasibility studies have explored multiparametric mapping and spectroscopy approaches that quantify the biochemical changes tissues undergo after death. These quantitative techniques remain largely research tools, but they hint at a future in which postmortem imaging does more than mirror autopsy — it measures things autopsy cannot.

Geography, however, remains a limiting factor. A 2023 survey of North American practice found that paediatric postmortem imaging is used far less consistently there than the European literature might suggest, and a companion European survey published the same year examined the fragile funding streams that support the work. Postmortem imaging often falls between budgetary stools: it is not routine diagnostic imaging with a living patient, nor is it always funded as part of forensic or medico-legal investigation. The commentary is candid that reimbursement and sustainable financing are now among the biggest obstacles to wider adoption, perhaps bigger than any technical question about image quality or diagnostic accuracy.

The institutional response has been to widen the coalition. In 2026, a multi-society statement on implementing paediatric and fetal postmortem imaging into clinical practice was issued jointly by the European Society of Paediatric Radiology, the Society for Pediatric Radiology, the Latin American Society of Pediatric Radiology, the Asian and Oceanic Society for Pediatric Radiology, the World Federation of Pediatric Imaging and the International Association of Forensic Radiographers. That breadth matters. It signals that the field is no longer a European project but a global one, and it gives radiologists, pathologists, coroners and health administrators on multiple continents a common reference point when they argue for local services.

Technology continues to move as well. Among the developments highlighted in the commentary’s own journal is early experience with photon-counting detector CT in paediatric postmortem imaging, a detector technology that offers higher spatial resolution and improved tissue contrast at comparable or lower radiation exposure than conventional CT. For a field whose credibility depends on detecting small, subtle findings — a hairline rib fracture, a tiny intracranial haemorrhage, a subtle malformation — such hardware advances could meaningfully shift diagnostic performance. The commentary also notes the publication of a comprehensive textbook on postmortem imaging of the fetus and child in 2025, consolidating a decade of accumulated knowledge into a single reference for practitioners entering the field.

Where does the field go from here? The commentary’s implicit answer is that the scientific groundwork has largely been laid and the remaining battles are organizational: funding, service implementation, training and the slow work of convincing legal systems and bereaved families that imaging can stand alongside — or in some cases replace — conventional autopsy. For early pregnancy loss, less-invasive autopsy approaches have already been shown to offer families answers where a full autopsy would be declined. The decade since “mortui vivos docent” has not eliminated the need for pathologists, and few in the field claim it should; instead, imaging has become a complementary tool that can guide autopsy, replace it when families refuse it, and extract information from bodies that must otherwise go unexamined. The dead, it turns out, teach the living best when the living build the systems to listen.

Subject of Research: Paediatric and perinatal postmortem imaging

Article Title: 10 years of paediatric and perinatal postmortem imaging: where are we now?

Article References: Arthurs, O. J., & van Rijn, R. R. (2026). 10 years of paediatric and perinatal postmortem imaging: where are we now?. Pediatric Radiology. https://doi.org/10.1007/s00247-026-06795-9

Image Credits: AI Generated

DOI: 10.1007/s00247-026-06795-9

Keywords: postmortem imaging, paediatric radiology, perinatal autopsy, postmortem MRI, postmortem CT, ESPR task force, less-invasive autopsy, fetal imaging, forensic radiology, structured reporting, photon-counting CT, Pediatric Radiology